Limiting device for upper machine inclined ladder of bucket-wheel excavator

Abstract

An upper machine inclined ladder limiting device of a bucket-wheel excavator comprises a lower ladder assembly (1), an upper ladder assembly (2) and a counterweight assembly (3), according to the technical key points, the counterweight assembly (3) comprises a main frame (34) used for fixing a top butt strap (221), a support assembly (33) vertically arranged, a support cross beam (32) which is horizontally fixed between an upper oblique beam (223) and the support assembly (33) and is parallel to the top butt strap (221), and a support oblique beam (31) which is obliquely fixed on the side part of the support assembly (33) and is parallel to the upper oblique beam (223). The device has the advantages of simple structure, convenience in installation, safety, reliability and the like.

Description

Technical Field

[0001] The invention relates to a safety device for a crane used for lifting or lowering a load, in particular to a limit device for an inclined ladder on a bucket wheel excavator, which is mainly suitable for bucket wheel excavators in open-pit mines. Background Art

[0002] If the inclined ladder of the bucket wheel excavator is not equipped with a limit device or the limit device is not suitable, then when the on-site staff climbs from the bottom of the inclined ladder to the platform, if the counterweight is too large, the inclined ladder will return to a position above the horizontal. In this way, when other personnel climb up the platform from the ground via the inclined ladder, it is difficult for them to reach the inclined ladder due to the high height, and thus they cannot lower the inclined ladder. In addition, since there is no fixing measure after the inclined ladder is lowered, the inclined ladder will swing under the influence of severe weather conditions such as strong winds, and there may even be a safety accident where the staff will fall off the ladder. Summary of the invention

[0003] The purpose of the present invention is to provide a bucket wheel excavator upper machine inclined ladder limiting device, which fundamentally solves the above-mentioned problems and has the advantages of simple structure, convenient installation, safety and reliability, etc.

[0004] To achieve the above object, the present invention provides the following technical solution: the upper inclined ladder limiting device of the bucket wheel excavator includes a lower ladder assembly and an upper ladder assembly and a counterweight assembly connected to each other, and the technical key points are: The lower ladder assembly includes a pair of lower support assemblies arranged in parallel and lower handrail assemblies respectively arranged on the lower support assemblies; The lower handrail assembly includes a handrail outer frame in the shape of a parallelogram surrounded by a circular tube, and handrail reinforcing ribs fixed between opposite sides of the handrail outer frame; The lower support assembly includes a lower inclined beam arranged at an angle, a top connecting plate arranged on the top of the lower inclined beam, a plurality of tread plate assemblies arranged in the horizontal direction along the lower inclined beam, a horizontal support fixed to the bottom of the lower inclined beam and parallel thereto; a plurality of angle steel brackets vertically fixed to the lower inclined beam, the lower handrail assembly is fixed by the angle steel bracket, and a hinge hole located at the upper part and an arc hole concentric with the hinge hole are provided on the top connecting plate; The upper ladder assembly includes a pair of upper support assemblies arranged in parallel and upper handrail assemblies respectively arranged on the upper support assemblies; The upper support assembly includes an upper inclined beam arranged at an angle, a top strap fixed horizontally to the top of the upper inclined beam, and a bottom connecting plate fixed to the bottom of the upper inclined beam, wherein the bottom connecting plate is provided with a first connecting hole matched with the arc hole and a first connecting hole matched with the hinge hole; The tread assembly includes a pin that passes through the upper inclined beam, the second connection hole of the bottom connection plate, and the hinge hole, a nut and a washer that are screwed on the end of the pin and located on the outside of the top connection plate, a split pin that prevents the nut from loosening, and a stopper that passes through the arc hole to achieve sliding cooperation with the arc hole; The counterweight assembly includes a main frame for fixing the top plate, a vertically arranged support assembly, a support crossbeam horizontally fixed between the upper inclined beam and the support assembly and parallel to the top plate, and a support inclined beam obliquely fixed to the side of the support assembly and parallel to the upper inclined beam.

[0005] Beneficial effects of the present invention: In terms of the overall technical solution, the bottom of the upper ladder assembly is rotatably hinged with the top of the lower ladder assembly, and a counterweight assembly is arranged at the hinge. When a worker climbs from the bottom of the inclined ladder to the platform, the lower ladder assembly rotates to a horizontal position under the action of the counterweight assembly, and the movement stroke of the retaining shaft is limited by the arc hole of the top connecting plate, thereby limiting the upward movement of the inclined ladder, thereby avoiding the problem that when other personnel climb from the ground to the platform by the inclined ladder, the height is too high and their hands cannot reach the inclined ladder, so they cannot put the ladder down.

[0006] In terms of structural design, the tread assembly adopts the connection method of pin shaft, nut and washer, and the anti-loosening design of the split pin, which ensures the stability and safety of the tread. The structural design of the main frame, supporting total volume, supporting crossbeam and supporting inclined beam in the counterweight assembly ensures the strength and stability of the counterweight assembly, thereby ensuring the safety and reliability of the inclined ladder.

[0007] In summary, the present invention has a simple and compact structure, is easy to use, and is highly safe, and can automatically switch between the horizontal position and the use position without setting a driving structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is an isometric structural schematic diagram of the lower ladder assembly of the present invention.

[0009] Figure 2 It is a side structural schematic diagram of the upper ladder assembly of the present invention.

[0010] Figure 2a for Figure 2 Schematic diagram of the cross-sectional structure along line AA.

[0011] Figure 3 It is a structural schematic diagram of the present invention in an unfolded state.

[0012] Figure 3a for Figure 3 Schematic diagram of the cross-sectional structure along line BB.

[0013] Figure 3b for Figure 3a Schematic diagram of the local enlarged structure of part C in the middle.

[0014] Figure 4 It is a schematic diagram of the structure of the present invention in a folded state. DETAILED DESCRIPTION

[0015] The following combination Figures 1 to 4 The specific content of the present invention is described in detail through specific embodiments. The inclined ladder limiting device for a bucket wheel excavator comprises a lower ladder assembly 1 and an upper ladder assembly 2 and a counterweight assembly 3 which are connected to each other.

[0016] The lower ladder assembly 1 includes a pair of lower support assemblies 12 arranged in parallel, and lower handrail assemblies 11 respectively arranged on the lower support assemblies 12; The lower handrail assembly 11 includes a handrail outer frame 112 in the shape of a parallelogram surrounded by a circular tube, and a handrail reinforcing rib 111 fixed between opposite sides of the handrail outer frame 112; The lower support assembly 12 includes a lower inclined beam 121 inclined at 45 degrees, a top connecting plate 122 arranged at the top of the lower inclined beam 121, a plurality of tread plate assemblies 124 arranged in the horizontal direction along the lower inclined beam 121, and a horizontal support 125 fixed to the bottom of the lower inclined beam 121 and parallel thereto; a plurality of angle steel brackets 123 vertically fixed to the lower inclined beam 121, the lower handrail assembly 11 is fixed by the angle steel brackets 123, and the top connecting plate 122 is provided with a hinge hole 1222 located at the upper part and an arc hole 1221 concentric with the hinge hole 1222; The upper ladder assembly 2 includes a pair of upper support assemblies 22 arranged in parallel, and upper handrail assemblies 21 respectively arranged on the upper support assemblies 22; The upper support assembly 22 includes an upper inclined beam 223 inclined at 45 degrees, a top strap 221 horizontally fixed to the top of the upper inclined beam 223, and a bottom connecting plate 222 fixed to the bottom of the upper inclined beam 223. The bottom connecting plate 222 is provided with a first connecting hole 2221 matched with the arc hole 1221 and a first connecting hole 2221 matched with the hinge hole 1222. The tread assembly 124 includes a second connection hole 2222 that passes through the upper inclined beam 223 and the bottom connection plate 222, a pin 1241 that is arranged at the hinge hole 1222, a nut 1242 and a washer 1243 that are screwed on the end of the pin 1241 and located outside the top connection plate 122, a cotter pin 1244 that is used to prevent the nut 1242 from loosening, and a stopper shaft 1245 that passes through the arc hole 1221 and realizes sliding cooperation with the arc hole 1221; The counterweight assembly 3 includes a main frame 34 for fixing the top strap 221, a vertically arranged support assembly 33, a support crossbeam 32 horizontally fixed between the upper inclined beam 223 and the support assembly 33 and parallel to the top strap 221, and a support inclined beam 31 obliquely fixed to the side of the support assembly 33 and parallel to the upper inclined beam 223.

[0017] When in use, the lower ladder assembly 1 is lifted upward under the action of the counterweight assembly 3 at the other end. When it is horizontal, the arc hole 1221 effectively limits the range of motion of the stop shaft 1245, so that the lower ladder assembly 1 is just located at the preset upper limit in the horizontal direction; when a person needs to climb the inclined ladder, he needs to press the lower ladder assembly 1 downward with his hands, and the inclined body is as shown in FIG. Figure 3 When a person climbs onto the upper ladder assembly 2, the lower ladder assembly 1 is automatically retracted.

[0018] Description of reference numerals: 1 lower ladder assembly, 11 lower handrail assembly, 111 handrail reinforcement, 112 handrail outer frame, 12 lower support assembly, 121 lower inclined beam, 122 top connecting plate, 1221 arc hole, 1222 hinge hole, 123 angle steel bracket, 124 step plate assembly, 125 horizontal support, 126 hinge assembly, 1261 pin shaft, 1262 nut, 1263 washer, 1264 cotter pin, 1265 stop shaft; 2 upper ladder assembly, 21 upper handrail assembly, 22 upper support assembly, 221 top strap, 222 bottom connecting plate, 2221 first connecting hole, 2222 second connecting hole, 223 upper inclined beam; 3 counterweight assembly, 31 supporting diagonal beam, 32 supporting cross beam, 33 supporting total volume, 34 main frame.

Claims

1. A bucket wheel excavator upper inclined ladder limiting device, comprising a lower ladder assembly (1) and an upper ladder assembly (2) connected to each other, and a counterweight assembly (3), characterized in that: The lower ladder assembly (1) comprises a pair of lower support assemblies (12) arranged in parallel, and lower handrail assemblies (11) respectively arranged on the lower support assemblies (12); The lower handrail assembly (11) comprises a handrail outer frame (112) in the shape of a parallelogram surrounded by a circular tube, and a handrail reinforcing rib (111) fixed between opposite sides of the handrail outer frame (112); The lower support assembly (12) comprises a lower inclined beam (121) inclined at 45 degrees, a top connecting plate (122) arranged on the top of the lower inclined beam (121), a plurality of tread plate assemblies (124) arranged in the horizontal direction along the lower inclined beam (121), and a horizontal support (125) fixed to the bottom of the lower inclined beam (121) and parallel thereto; a plurality of angle steel brackets (123) vertically fixed on the lower inclined beam (121), the lower handrail assembly (11) is fixed by the angle steel brackets (123), and the top connecting plate (122) is provided with a hinge hole (1222) located at the top and an arc hole (1221) concentric with the hinge hole (1222); The upper ladder assembly (2) comprises a pair of upper support assemblies (22) arranged in parallel, and upper handrail assemblies (21) respectively arranged on the upper support assemblies (22); The upper support assembly (22) comprises an upper inclined beam (223) inclined at 45 degrees, a top strap (221) horizontally fixed to the top of the upper inclined beam (223), and a bottom connecting plate (222) fixed to the bottom of the upper inclined beam (223); the bottom connecting plate (222) is provided with a first connecting hole (2221) matched with the arc hole (1221) and a first connecting hole (2221) matched with the hinge hole (1222); The tread assembly (124) includes a pin (1241) penetrating the upper inclined beam (223), a second connecting hole (2222) of the bottom connecting plate (222), a hinged hole (1222) provided with a nut (1242) and a washer (1243) screwed on the end of the pin (1241) and located outside the top connecting plate (122), a cotter pin (1244) for preventing the nut (1242) from loosening, and a stopper shaft (1245) penetrating the arc hole (1221) to achieve sliding fit with the arc hole (1221); The counterweight assembly (3) comprises a main frame (34) for fixing a top slat (221), a vertically arranged support assembly (33), a support crossbeam (32) horizontally fixed between an upper inclined beam (223) and the support assembly (33) and parallel to the top slat (221), and a support inclined beam (31) obliquely fixed to a side of the support assembly (33) and parallel to the upper inclined beam (223).

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